(19)
(11) EP 1 750 133 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.05.2012 Bulletin 2012/19

(43) Date of publication A2:
07.02.2007 Bulletin 2007/06

(21) Application number: 06015581.9

(22) Date of filing: 26.07.2006
(51) International Patent Classification (IPC): 
G01P 15/08(2006.01)
G11B 19/04(2006.01)
 G01P 15/18(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 05.08.2005 JP 2005228026

(71) Applicant: HITACHI METALS, LTD.
Minato-ku, Tokyo 105-8614 (JP)

(72) Inventors:
  • Noda, Masaru
    Ninomiya Kanagawa 259-0122 (JP)
  • Abe, Yasunori
    Mohka 321-4335 (JP)

(74) Representative: Beetz & Partner 
Patentanwälte Steinsdorfstrasse 10
80538 München
80538 München (DE)

   


(54) Fall detection device


(57) A fall detection device is provided, which accomplishes a fall judgment on acceleration by a simple calculation and improves uniformity of effective threshold value for the acceleration judgment as to a direction of an applied acceleration vector. The fall detection device produces a fall detection signal, when an absolute value of each axis component of an acceleration measured by a three-axis acceleration sensor 1 is less than a first threshold value, and when a sum of the absolute values of the axis components of the acceleration is less than a second threshold value that is 1.5 times to twice the first threshold value.







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